70mL of Nitrogen gas combines with 35 mL oxygen to form 70 mL of what gas? (using g*y-Lussac's law)?

Question

In relation to g*y-Lussac's law of combining volumes ( that gasses combine in simple whole numbr ratios) of gases and Avagadro's hypothesis about gases having the same molecules per volume under the same conditions.

If you can, please outline how you got it please.

This question was in my inclass chemistry history assessment task yesterday, and because others got a different answer to me and im not too confident about mine. (N20)

thankyou

Answer 1

I agree with your answer (N2O, also known as laughing gas). The volume ratio of N2 to O2 is the same as the mole ratio, according to g*y-Lussac. So

N2 / O2 = 70 / 35 = 2/1. So there are two N's for every O. The only nitrogen oxygen compound I know of with such a ratio is N2O. Also, note that the mole ratio of N2 / product is 70 / 70, or 1/1. See the balanced equation below which agrees with all our facts.

2N2  +  O2  ==>  2N2O